The HJC CS-MX 2 Ellusion Dirt Bike Helmet is packed with features... Specifications Include: Advanced polycarbonate composite shell - Lightweight, superior fit and comfort using advanced CAD technology Large eye port ensuring maximum visibility and superior goggle fit 2 Shell sizes and 2 EPS sizes available - Optimum fit, minimum weight "ACS" Advanced Channeling Ventilation System - Full front to back airflow flushes heat and humidity up and out Double D-ring retention strap Removable and washable plush Nylex interior - Comfortable and practical Glasses groove - Optimal comfort for the persons wearing glasses ECE approved ACU Gold approved